Bulgaria's President Rosen Plevneliev is expected to dissolve parliament and name a caretaker cabinet, following weeks without a government.
Prime Minister Boyko Borisov resigned last month following persistent street protests against high energy bills, poverty and corruption.
The president has had major problems trying to fill the power vacuum, with parties refusing to form a government.
Protesters have threatened to surround parliament and stop MPs leaving, the BBC reports.
President Plevneliev has not announced who will make up the new cabinet - he is expected to pick mostly non-partisan, technocrat ministers.
Early elections are expected in May.